1221828Sgrehan/*- 2221828Sgrehan * Copyright (c) 2011 NetApp, Inc. 3221828Sgrehan * All rights reserved. 4221828Sgrehan * 5221828Sgrehan * Redistribution and use in source and binary forms, with or without 6221828Sgrehan * modification, are permitted provided that the following conditions 7221828Sgrehan * are met: 8221828Sgrehan * 1. Redistributions of source code must retain the above copyright 9221828Sgrehan * notice, this list of conditions and the following disclaimer. 10221828Sgrehan * 2. Redistributions in binary form must reproduce the above copyright 11221828Sgrehan * notice, this list of conditions and the following disclaimer in the 12221828Sgrehan * documentation and/or other materials provided with the distribution. 13221828Sgrehan * 14221828Sgrehan * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 15221828Sgrehan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16221828Sgrehan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17221828Sgrehan * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 18221828Sgrehan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19221828Sgrehan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20221828Sgrehan * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21221828Sgrehan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22221828Sgrehan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23221828Sgrehan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24221828Sgrehan * SUCH DAMAGE. 25221828Sgrehan * 26221828Sgrehan * $FreeBSD: releng/10.3/usr.sbin/bhyve/pci_virtio_block.c 284900 2015-06-28 03:22:26Z neel $ 27221828Sgrehan */ 28221828Sgrehan 29221828Sgrehan#include <sys/cdefs.h> 30221828Sgrehan__FBSDID("$FreeBSD: releng/10.3/usr.sbin/bhyve/pci_virtio_block.c 284900 2015-06-28 03:22:26Z neel $"); 31221828Sgrehan 32221828Sgrehan#include <sys/param.h> 33221828Sgrehan#include <sys/linker_set.h> 34221828Sgrehan#include <sys/stat.h> 35221828Sgrehan#include <sys/uio.h> 36221828Sgrehan#include <sys/ioctl.h> 37244013Sgrehan#include <sys/disk.h> 38221828Sgrehan 39221828Sgrehan#include <errno.h> 40221828Sgrehan#include <fcntl.h> 41221828Sgrehan#include <stdio.h> 42221828Sgrehan#include <stdlib.h> 43221828Sgrehan#include <stdint.h> 44221828Sgrehan#include <string.h> 45221828Sgrehan#include <strings.h> 46221828Sgrehan#include <unistd.h> 47221828Sgrehan#include <assert.h> 48221828Sgrehan#include <pthread.h> 49256390Sgrehan#include <md5.h> 50221828Sgrehan 51244167Sgrehan#include "bhyverun.h" 52221828Sgrehan#include "pci_emul.h" 53221828Sgrehan#include "virtio.h" 54280744Smav#include "block_if.h" 55221828Sgrehan 56221828Sgrehan#define VTBLK_RINGSZ 64 57221828Sgrehan 58221828Sgrehan#define VTBLK_S_OK 0 59221828Sgrehan#define VTBLK_S_IOERR 1 60256390Sgrehan#define VTBLK_S_UNSUPP 2 61221828Sgrehan 62256390Sgrehan#define VTBLK_BLK_ID_BYTES 20 63256390Sgrehan 64257128Sgrehan/* Capability bits */ 65257128Sgrehan#define VTBLK_F_SEG_MAX (1 << 2) /* Maximum request segments */ 66280243Smav#define VTBLK_F_BLK_SIZE (1 << 6) /* cfg block size valid */ 67280750Smav#define VTBLK_F_FLUSH (1 << 9) /* Cache flush support */ 68280243Smav#define VTBLK_F_TOPOLOGY (1 << 10) /* Optimal I/O alignment */ 69257128Sgrehan 70221828Sgrehan/* 71221828Sgrehan * Host capabilities 72221828Sgrehan */ 73221828Sgrehan#define VTBLK_S_HOSTCAPS \ 74257128Sgrehan ( VTBLK_F_SEG_MAX | \ 75257128Sgrehan VTBLK_F_BLK_SIZE | \ 76280750Smav VTBLK_F_FLUSH | \ 77280243Smav VTBLK_F_TOPOLOGY | \ 78253440Sgrehan VIRTIO_RING_F_INDIRECT_DESC ) /* indirect descriptors */ 79221828Sgrehan 80221828Sgrehan/* 81253440Sgrehan * Config space "registers" 82221828Sgrehan */ 83221828Sgrehanstruct vtblk_config { 84221828Sgrehan uint64_t vbc_capacity; 85221828Sgrehan uint32_t vbc_size_max; 86221828Sgrehan uint32_t vbc_seg_max; 87280243Smav struct { 88280243Smav uint16_t cylinders; 89280243Smav uint8_t heads; 90280243Smav uint8_t sectors; 91280243Smav } vbc_geometry; 92221828Sgrehan uint32_t vbc_blk_size; 93280243Smav struct { 94280243Smav uint8_t physical_block_exp; 95280243Smav uint8_t alignment_offset; 96280243Smav uint16_t min_io_size; 97280243Smav uint32_t opt_io_size; 98280243Smav } vbc_topology; 99280243Smav uint8_t vbc_writeback; 100221828Sgrehan} __packed; 101221828Sgrehan 102221828Sgrehan/* 103221828Sgrehan * Fixed-size block header 104221828Sgrehan */ 105221828Sgrehanstruct virtio_blk_hdr { 106247342Sneel#define VBH_OP_READ 0 107247342Sneel#define VBH_OP_WRITE 1 108276349Sneel#define VBH_OP_FLUSH 4 109276349Sneel#define VBH_OP_FLUSH_OUT 5 110256390Sgrehan#define VBH_OP_IDENT 8 111247342Sneel#define VBH_FLAG_BARRIER 0x80000000 /* OR'ed into vbh_type */ 112221828Sgrehan uint32_t vbh_type; 113221828Sgrehan uint32_t vbh_ioprio; 114221828Sgrehan uint64_t vbh_sector; 115221828Sgrehan} __packed; 116221828Sgrehan 117221828Sgrehan/* 118221828Sgrehan * Debug printf 119221828Sgrehan */ 120221828Sgrehanstatic int pci_vtblk_debug; 121221828Sgrehan#define DPRINTF(params) if (pci_vtblk_debug) printf params 122221828Sgrehan#define WPRINTF(params) printf params 123221828Sgrehan 124280744Smavstruct pci_vtblk_ioreq { 125280744Smav struct blockif_req io_req; 126280744Smav struct pci_vtblk_softc *io_sc; 127280744Smav uint8_t *io_status; 128280744Smav uint16_t io_idx; 129280744Smav}; 130280744Smav 131221828Sgrehan/* 132221828Sgrehan * Per-device softc 133221828Sgrehan */ 134221828Sgrehanstruct pci_vtblk_softc { 135253440Sgrehan struct virtio_softc vbsc_vs; 136267393Sjhb pthread_mutex_t vsc_mtx; 137253440Sgrehan struct vqueue_info vbsc_vq; 138280744Smav struct vtblk_config vbsc_cfg; 139280744Smav struct blockif_ctxt *bc; 140256390Sgrehan char vbsc_ident[VTBLK_BLK_ID_BYTES]; 141280744Smav struct pci_vtblk_ioreq vbsc_ios[VTBLK_RINGSZ]; 142221828Sgrehan}; 143221828Sgrehan 144253440Sgrehanstatic void pci_vtblk_reset(void *); 145253440Sgrehanstatic void pci_vtblk_notify(void *, struct vqueue_info *); 146253440Sgrehanstatic int pci_vtblk_cfgread(void *, int, int, uint32_t *); 147253440Sgrehanstatic int pci_vtblk_cfgwrite(void *, int, int, uint32_t); 148246214Sneel 149253440Sgrehanstatic struct virtio_consts vtblk_vi_consts = { 150253440Sgrehan "vtblk", /* our name */ 151253440Sgrehan 1, /* we support 1 virtqueue */ 152253440Sgrehan sizeof(struct vtblk_config), /* config reg size */ 153253440Sgrehan pci_vtblk_reset, /* reset */ 154253440Sgrehan pci_vtblk_notify, /* device-wide qnotify */ 155253440Sgrehan pci_vtblk_cfgread, /* read PCI config */ 156253440Sgrehan pci_vtblk_cfgwrite, /* write PCI config */ 157271685Sgrehan NULL, /* apply negotiated features */ 158253440Sgrehan VTBLK_S_HOSTCAPS, /* our capabilities */ 159253440Sgrehan}; 160246214Sneel 161221828Sgrehanstatic void 162253440Sgrehanpci_vtblk_reset(void *vsc) 163221828Sgrehan{ 164253440Sgrehan struct pci_vtblk_softc *sc = vsc; 165221828Sgrehan 166253440Sgrehan DPRINTF(("vtblk: device reset requested !\n")); 167253440Sgrehan vi_reset_dev(&sc->vbsc_vs); 168221828Sgrehan} 169221828Sgrehan 170221828Sgrehanstatic void 171280744Smavpci_vtblk_done(struct blockif_req *br, int err) 172280744Smav{ 173280744Smav struct pci_vtblk_ioreq *io = br->br_param; 174280744Smav struct pci_vtblk_softc *sc = io->io_sc; 175280744Smav 176280744Smav /* convert errno into a virtio block error return */ 177280744Smav if (err == EOPNOTSUPP || err == ENOSYS) 178280744Smav *io->io_status = VTBLK_S_UNSUPP; 179280744Smav else if (err != 0) 180280744Smav *io->io_status = VTBLK_S_IOERR; 181280744Smav else 182280744Smav *io->io_status = VTBLK_S_OK; 183280744Smav 184280744Smav /* 185280744Smav * Return the descriptor back to the host. 186280744Smav * We wrote 1 byte (our status) to host. 187280744Smav */ 188280744Smav pthread_mutex_lock(&sc->vsc_mtx); 189280744Smav vq_relchain(&sc->vbsc_vq, io->io_idx, 1); 190280744Smav vq_endchains(&sc->vbsc_vq, 0); 191280744Smav pthread_mutex_unlock(&sc->vsc_mtx); 192280744Smav} 193280744Smav 194280744Smavstatic void 195253440Sgrehanpci_vtblk_proc(struct pci_vtblk_softc *sc, struct vqueue_info *vq) 196221828Sgrehan{ 197221828Sgrehan struct virtio_blk_hdr *vbh; 198280744Smav struct pci_vtblk_ioreq *io; 199253440Sgrehan int i, n; 200221828Sgrehan int err; 201282307Smav ssize_t iolen; 202253440Sgrehan int writeop, type; 203221828Sgrehan off_t offset; 204280749Smav struct iovec iov[BLOCKIF_IOV_MAX + 2]; 205280749Smav uint16_t idx, flags[BLOCKIF_IOV_MAX + 2]; 206221828Sgrehan 207280749Smav n = vq_getchain(vq, &idx, iov, BLOCKIF_IOV_MAX + 2, flags); 208221828Sgrehan 209253440Sgrehan /* 210253440Sgrehan * The first descriptor will be the read-only fixed header, 211253440Sgrehan * and the last is for status (hence +2 above and below). 212253440Sgrehan * The remaining iov's are the actual data I/O vectors. 213253440Sgrehan * 214253440Sgrehan * XXX - note - this fails on crash dump, which does a 215253440Sgrehan * VIRTIO_BLK_T_FLUSH with a zero transfer length 216253440Sgrehan */ 217280749Smav assert(n >= 2 && n <= BLOCKIF_IOV_MAX + 2); 218221828Sgrehan 219280744Smav io = &sc->vbsc_ios[idx]; 220253440Sgrehan assert((flags[0] & VRING_DESC_F_WRITE) == 0); 221253440Sgrehan assert(iov[0].iov_len == sizeof(struct virtio_blk_hdr)); 222253440Sgrehan vbh = iov[0].iov_base; 223280744Smav memcpy(&io->io_req.br_iov, &iov[1], sizeof(struct iovec) * (n - 2)); 224280744Smav io->io_req.br_iovcnt = n - 2; 225280744Smav io->io_req.br_offset = vbh->vbh_sector * DEV_BSIZE; 226280744Smav io->io_status = iov[--n].iov_base; 227253440Sgrehan assert(iov[n].iov_len == 1); 228253440Sgrehan assert(flags[n] & VRING_DESC_F_WRITE); 229221828Sgrehan 230221828Sgrehan /* 231247342Sneel * XXX 232247342Sneel * The guest should not be setting the BARRIER flag because 233247342Sneel * we don't advertise the capability. 234247342Sneel */ 235247342Sneel type = vbh->vbh_type & ~VBH_FLAG_BARRIER; 236247342Sneel writeop = (type == VBH_OP_WRITE); 237221828Sgrehan 238253440Sgrehan iolen = 0; 239253440Sgrehan for (i = 1; i < n; i++) { 240221828Sgrehan /* 241221828Sgrehan * - write op implies read-only descriptor, 242256390Sgrehan * - read/ident op implies write-only descriptor, 243221828Sgrehan * therefore test the inverse of the descriptor bit 244221828Sgrehan * to the op. 245221828Sgrehan */ 246253440Sgrehan assert(((flags[i] & VRING_DESC_F_WRITE) == 0) == writeop); 247253440Sgrehan iolen += iov[i].iov_len; 248221828Sgrehan } 249282307Smav io->io_req.br_resid = iolen; 250221828Sgrehan 251282307Smav DPRINTF(("virtio-block: %s op, %zd bytes, %d segs, offset %ld\n\r", 252256390Sgrehan writeop ? "write" : "read/ident", iolen, i - 1, offset)); 253221828Sgrehan 254256390Sgrehan switch (type) { 255280744Smav case VBH_OP_READ: 256280744Smav err = blockif_read(sc->bc, &io->io_req); 257280744Smav break; 258256390Sgrehan case VBH_OP_WRITE: 259280744Smav err = blockif_write(sc->bc, &io->io_req); 260256390Sgrehan break; 261280744Smav case VBH_OP_FLUSH: 262280744Smav case VBH_OP_FLUSH_OUT: 263280744Smav err = blockif_flush(sc->bc, &io->io_req); 264256390Sgrehan break; 265256390Sgrehan case VBH_OP_IDENT: 266256390Sgrehan /* Assume a single buffer */ 267280747Smav /* S/n equal to buffer is not zero-terminated. */ 268280747Smav memset(iov[1].iov_base, 0, iov[1].iov_len); 269280747Smav strncpy(iov[1].iov_base, sc->vbsc_ident, 270268976Sjhb MIN(iov[1].iov_len, sizeof(sc->vbsc_ident))); 271280744Smav pci_vtblk_done(&io->io_req, 0); 272280744Smav return; 273256390Sgrehan default: 274280744Smav pci_vtblk_done(&io->io_req, EOPNOTSUPP); 275280744Smav return; 276256390Sgrehan } 277280744Smav assert(err == 0); 278221828Sgrehan} 279221828Sgrehan 280221828Sgrehanstatic void 281253440Sgrehanpci_vtblk_notify(void *vsc, struct vqueue_info *vq) 282249813Sneel{ 283253440Sgrehan struct pci_vtblk_softc *sc = vsc; 284249813Sneel 285253440Sgrehan while (vq_has_descs(vq)) 286253440Sgrehan pci_vtblk_proc(sc, vq); 287249813Sneel} 288249813Sneel 289221828Sgrehanstatic int 290221828Sgrehanpci_vtblk_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts) 291221828Sgrehan{ 292280744Smav char bident[sizeof("XX:X:X")]; 293280744Smav struct blockif_ctxt *bctxt; 294256390Sgrehan MD5_CTX mdctx; 295256390Sgrehan u_char digest[16]; 296221828Sgrehan struct pci_vtblk_softc *sc; 297280744Smav off_t size; 298280744Smav int i, sectsz, sts, sto; 299221828Sgrehan 300221828Sgrehan if (opts == NULL) { 301221828Sgrehan printf("virtio-block: backing device required\n"); 302221828Sgrehan return (1); 303221828Sgrehan } 304221828Sgrehan 305221828Sgrehan /* 306221828Sgrehan * The supplied backing file has to exist 307221828Sgrehan */ 308280744Smav snprintf(bident, sizeof(bident), "%d:%d", pi->pi_slot, pi->pi_func); 309280744Smav bctxt = blockif_open(opts, bident); 310280744Smav if (bctxt == NULL) { 311221828Sgrehan perror("Could not open backing file"); 312221828Sgrehan return (1); 313221828Sgrehan } 314221828Sgrehan 315280744Smav size = blockif_size(bctxt); 316280744Smav sectsz = blockif_sectsz(bctxt); 317280744Smav blockif_psectsz(bctxt, &sts, &sto); 318244013Sgrehan 319268953Sjhb sc = calloc(1, sizeof(struct pci_vtblk_softc)); 320280744Smav sc->bc = bctxt; 321280744Smav for (i = 0; i < VTBLK_RINGSZ; i++) { 322280744Smav struct pci_vtblk_ioreq *io = &sc->vbsc_ios[i]; 323280744Smav io->io_req.br_callback = pci_vtblk_done; 324280744Smav io->io_req.br_param = io; 325280744Smav io->io_sc = sc; 326280744Smav io->io_idx = i; 327280744Smav } 328221828Sgrehan 329267393Sjhb pthread_mutex_init(&sc->vsc_mtx, NULL); 330267393Sjhb 331253440Sgrehan /* init virtio softc and virtqueues */ 332253440Sgrehan vi_softc_linkup(&sc->vbsc_vs, &vtblk_vi_consts, sc, pi, &sc->vbsc_vq); 333267393Sjhb sc->vbsc_vs.vs_mtx = &sc->vsc_mtx; 334267393Sjhb 335253440Sgrehan sc->vbsc_vq.vq_qsize = VTBLK_RINGSZ; 336253440Sgrehan /* sc->vbsc_vq.vq_notify = we have no per-queue notify */ 337253440Sgrehan 338256390Sgrehan /* 339256390Sgrehan * Create an identifier for the backing file. Use parts of the 340256390Sgrehan * md5 sum of the filename 341256390Sgrehan */ 342256390Sgrehan MD5Init(&mdctx); 343256390Sgrehan MD5Update(&mdctx, opts, strlen(opts)); 344256390Sgrehan MD5Final(digest, &mdctx); 345256390Sgrehan sprintf(sc->vbsc_ident, "BHYVE-%02X%02X-%02X%02X-%02X%02X", 346256390Sgrehan digest[0], digest[1], digest[2], digest[3], digest[4], digest[5]); 347256390Sgrehan 348221828Sgrehan /* setup virtio block config space */ 349257128Sgrehan sc->vbsc_cfg.vbc_capacity = size / DEV_BSIZE; /* 512-byte units */ 350280243Smav sc->vbsc_cfg.vbc_size_max = 0; /* not negotiated */ 351280749Smav sc->vbsc_cfg.vbc_seg_max = BLOCKIF_IOV_MAX; 352280243Smav sc->vbsc_cfg.vbc_geometry.cylinders = 0; /* no geometry */ 353280243Smav sc->vbsc_cfg.vbc_geometry.heads = 0; 354280243Smav sc->vbsc_cfg.vbc_geometry.sectors = 0; 355244013Sgrehan sc->vbsc_cfg.vbc_blk_size = sectsz; 356280243Smav sc->vbsc_cfg.vbc_topology.physical_block_exp = 357280243Smav (sts > sectsz) ? (ffsll(sts / sectsz) - 1) : 0; 358280243Smav sc->vbsc_cfg.vbc_topology.alignment_offset = 359280243Smav (sto != 0) ? ((sts - sto) / sectsz) : 0; 360280243Smav sc->vbsc_cfg.vbc_topology.min_io_size = 0; 361280243Smav sc->vbsc_cfg.vbc_topology.opt_io_size = 0; 362280243Smav sc->vbsc_cfg.vbc_writeback = 0; 363221828Sgrehan 364253440Sgrehan /* 365253440Sgrehan * Should we move some of this into virtio.c? Could 366253440Sgrehan * have the device, class, and subdev_0 as fields in 367253440Sgrehan * the virtio constants structure. 368253440Sgrehan */ 369221828Sgrehan pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_BLOCK); 370221828Sgrehan pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR); 371221828Sgrehan pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_STORAGE); 372221828Sgrehan pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_TYPE_BLOCK); 373284900Sneel pci_set_cfgdata16(pi, PCIR_SUBVEND_0, VIRTIO_VENDOR); 374246214Sneel 375280744Smav if (vi_intr_init(&sc->vbsc_vs, 1, fbsdrun_virtio_msix())) { 376280744Smav blockif_close(sc->bc); 377280744Smav free(sc); 378253440Sgrehan return (1); 379280744Smav } 380253440Sgrehan vi_set_io_bar(&sc->vbsc_vs, 0); 381221828Sgrehan return (0); 382221828Sgrehan} 383221828Sgrehan 384253440Sgrehanstatic int 385253440Sgrehanpci_vtblk_cfgwrite(void *vsc, int offset, int size, uint32_t value) 386246214Sneel{ 387246214Sneel 388253440Sgrehan DPRINTF(("vtblk: write to readonly reg %d\n\r", offset)); 389253440Sgrehan return (1); 390246214Sneel} 391246214Sneel 392253440Sgrehanstatic int 393253440Sgrehanpci_vtblk_cfgread(void *vsc, int offset, int size, uint32_t *retval) 394221828Sgrehan{ 395253440Sgrehan struct pci_vtblk_softc *sc = vsc; 396222830Sgrehan void *ptr; 397221828Sgrehan 398253440Sgrehan /* our caller has already verified offset and size */ 399253440Sgrehan ptr = (uint8_t *)&sc->vbsc_cfg + offset; 400253440Sgrehan memcpy(retval, ptr, size); 401253440Sgrehan return (0); 402221828Sgrehan} 403221828Sgrehan 404221828Sgrehanstruct pci_devemu pci_de_vblk = { 405241744Sgrehan .pe_emu = "virtio-blk", 406241744Sgrehan .pe_init = pci_vtblk_init, 407253440Sgrehan .pe_barwrite = vi_pci_write, 408253440Sgrehan .pe_barread = vi_pci_read 409221828Sgrehan}; 410221828SgrehanPCI_EMUL_SET(pci_de_vblk); 411